Naftaly, M; Savvides, G; Alshareef, F; Flanigan, P; Lui, G L; Florescu, M; Mullen, R A (2022) Non-Destructive Porosity Measurements of 3D Printed Polymer by Terahertz Time-Domain Spectroscopy. Applied Sciences, 12 (2). 927

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Abstract

Porosity and inhomogeneity of 3D printed polymer samples were examined using terahertz time-domain spectroscopy, and the effects of 3D printer settings were analyzed. A set of PETG samples were 3D printed by systematically varying printer parameters, including layer thickness, nozzle diameter, filament (line) thickness, extrusion, and printing pattern. Their effective refractive indices and loss coefficients were measured and compared with those of solid PETG. Porosity was calculated from the refractive index. A diffraction feature was observed in the loss spectrum of all 3D printed samples and was used as an indication of inhomogeneity. A “sweet spot” of printer settings was found where porosity and inhomogeneity were minimized.

Item Type:	Article
Subjects:	Optical Radiation and Photonics > Materials and Appearance
Divisions:	Electromagnetic & Electrochemical Technologies
Identification number/DOI:	10.3390/app12020927
Last Modified:	22 Sep 2023 10:18
URI:	https://eprintspublications.npl.co.uk/id/eprint/9526